Rotary engine.



No. 777,384. PATENTED DEC. 13, 1904.

W. F. R MIST.

ROTARY ENGINE.

APPLICATION FILED 001 .27, 1903.

,N0 MODEL 5 SHEETS-SHEET 1.

PATBNTED DEC. 18; 1904.

W. F. R. MIST.

ROTARY ENGINE.

APPLICATION FILED 00127, 1903.

5 SKEETS-SHEET 2.

NO MODEL.

I I l I u I I wus PATENTED D120. 13, 1904.

W. F. R. MIST.

ROTARY ENGINE.

APPLICATION FILED OUT. 21, 1903.

6 SKEETB-BHEET 3.

N0 MODEL.

:IIIIIINIIIIIIIIIHIHHH ullnl No. 777,384. PATENTED DEC. 13, 1904. W. F. P. MIST.

ROTARY ENGINE.

' APPLICATION FILED 0013.27, 1903.

NU MODEL. 5 SHEETB BHEET 5.

UNTTED STATES Patented December 13, 1904.

PATENT @EEICE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 777,384, dated December 13, 1904.

Application filed October 27, 1903. Serial No. 178,794. (No model.)

To all whom, it 77716717] concern:

Be it known that I, WILLIAM FREDERICK ROBERT Misr, a subject of the King of Great Britain and Ireland, residing at 97 Barden road, Ton bridge, in the county of Kent, England, have invented certain new and useful Improvements in Rotary Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in rotary engines,.which I will now describe with reference to the drawings accompanying this specification, in whicl Figure 1 shows an elevation of rotary engine constructed according to my invention. Fig. 2 shows a plan of same. Fig. 3 shows an end elevation looking in the direction of the arrow A, Fig. 1. Fig. 4: shows another end elevation looking in the direction of the arrow B, Fig. 1. Fig. 5 shows a vertical section of Fig. 1. Fig. 6 shows an end elevation of the cylinder with a fin cast therewith and also showing a fin permanently fixed to the tnbular shaft drawn to a larger scale. Fig. 7 showsa vertical section of same; Fig. 8, an end elevation of cover with steam and exhaust chest removed. Fig. 9 shows an elevation of ratchet-wheel, showing the two cams for operating the valve-rods drawn to a larger scale; Fig. 10, a plan of same. Fig. 11 shows an elevation of the steam-chest drawn to a larger scale. Fig. 12 shows a sectional plan of same. Fig. 13 shows an oblique section taken through the line C I), Fig. i. Figs. l t to 20, inclusive, show various views, drawn to a larger scale, hereinafter referred to.

The same characters of reference denote the same parts in all the views.

(0, Figs. 5 and 6, shows a revolving cylinder fitted with an internal vane or piston 7'. Such piston is made to fit steam-tight on the tubular shaft 0, Fig. 2. The method of litting same steam-tight is as follows: The lower part of the piston is in the form of a sleeve, into which takes a piece of metal 61, cut to correspond with sleeve, and a spring a, placed within a groove, causes the said piece to be pressed down when fitted into sleeve. On

each side of fin, working against cover-plate, is a piece of metal (1, fitted to form a lap. On the outer face of cylinder 1s a pro ection f, Fig. 7, or tubular shaft corresponding in size to the tubular shaft 0. 'lhrough this (and the tubular shaft 0) passes the solid shaft g. In the projection f is a shoulder f". The outer edge of the cylinder is flanged (at 71 Fig. where it revolves within the-cover A balance-weight 7:, Figs. 6 and 7 is fixed on outside of cylinder to counterbalance the fin 7) inside. In the cylinder works tubular shaft 0 over solid shaft g. On the shaft 0 is fitted another vane or piston, Fig. 6, of such length that it fits the inside of cylinder at. The method of keeping this piston steamtight against inner part of cylinder (4 is as-follows: The piston 7' is provided with a sleeve or recess within it. The upper part l of the piston is cut to fit this sleeve, and to this part is fitted a spring m, which when fitted within sleeve keeps flange Z close up to cylinder (4. This flange l is made of suitable size to form a lap. Side packing-pieces Z (see Fig. 15) are fitted each side of fin j, and these are pressed outward by springs 58, fitted in recesses 59.

Within tubular shafts o and f runs solid shafting 7, Fig. l.

The flanged edge it of revolving cylinder a, Fig. 5, revolves in and works against a cover or plate 7:, Fig. l, fitted to the support a. Behind this cover and fitting upon support n is fitted the steam and exhaust chest 39. in the cover are cut ports communicating and corresponding with steam and exhaust ports in steam and exhaust chest.

The steam-jacket s, Fig. l, is bolted to flange of cover 7?. The steam-jackct is larger in diameter near its flange 25 to permit the dish a, attached to revolving cylinder a, (carryin g the cams a w, workingex pansiou-valves,) to revolve in The outer end of steam-jacket is bored to size of adjusting-cone m, (shown more clearly at Fig. 14,) which on its inner face is grooved and fitted with hall-bearings working on end of cylinder a. This adjusting-cone r fits over projecting shaft f of cylinder a and screws into thread of steamjacket s. When adjusted, the locking-nut y retains the adjustment.

Within the supports 2 1 2 3 revolve the ratchet-wheels 4, 5, 6, and 7, mounted on a tubular shaft corresponding with shaft 0 and coupled on their respective sides to sleeve f of cylinder a and end of shaft 0, Fig. 5. The ratchet-wheels 5 6 are notched for direct driving and are fitted with pawls 9 for the purpose, and the ratchet-wheels 4 and 7 are also notched for reverse driving and are fitted with pawls 8 and 11. Pawls 9 and 10 on ratchet-wheels 5 and 6 are to receive back pressure when engine is driven direct. Pawls 8 and 11 on ratchet-wheels 4 and 7 are to receive back pressure when engine is driven reis a small wheel 7 with a counterbalanceweight cast on it, Figs. 1 and 2, to counterbalance the fin y'. The free wheels 15 and 16 are connected in a similar manner by the bars 17 and form sliding bolts working within ratchet-wheels 6 and 7. The collars 18 are attached to solid shaft 9 and are fitted with clutch-holes 19 to take clutches 20, (one of which is shown,) fitted on inner cone of free wheels 12, 13, 15, and 16. To throw the free wheels in and out of gear, any known clutch may be employed. The free wheels 13 and 16 are for direct driving. The free wheels 12 and 15 are for driving reverse. The free wheels are only connected to solid shaft when clutched in collars 18. 21 represents couplings for tubular shafts 0, 0, and f. (Shown enlarged at Fig. 14.)

Fitted to the outer edge of cylinder (4 behind its flange h and revolving in the raised portion of steam-jacket s is a flange u, Figs.

5 and 13. To the outer circumference of this i is fitted a cam-plate 10 at a suitable angle, on which takes the jumper-rod 23 in direct driving. On the inner circumference is another cam, 1;, also at a suitable angle, on which takes the jumper 22 for reverse driving. On the inner side of ratchet-wheel 6 are cams 39 and 40, (see Figs. 9, 10, and 13,) fitted at suitable angles and used for a similar purpose. The rod 26 connects the rods 23 and 24. On the end of rod 24 and within the steam-chest 39 is fitted a slide 27, which is made to move over steam-port 41 when the cams take on rollers. When the cams pass rollers, a spring 29 outside steam-chest withdraws the plug or slide from steam ports. Rods 22 and 24 work slide 28. Rods 23 and 24 work slide 27.

Exhaust-pipes 30 and 31 are fitted on either side of exhaust-chambers and are so arranged that when port 33 is open port 32 is closed. (See Fig. 8.) Port 32 is open in direct driving and port 33 is closed. Port 33 is open in reverse driving and port 32 is closed. The steam-ports 55 and 56 are so arranged that port 55 is open in direct driving and port 56 closed. The positions are reversed in reversing the engine. The position of steam and exhaust ports as here shown is as follows: The stationary piston is between steam-ports. Then the moving piston after the revolution comes in contact with the other piston, simultaneously the lap of this moving piston must just open exhaust.

38, Fig. 1, is a pulley-wheel. The method of working the wheel is as follows, assuming the steam-port 55'to be open and port 56 closed, Fig. 8, and this exhaust-port 32 open and port 33 closed, and the pawls 8 and 11 on ratchet-wheels 4 and 7 to be clear of the notches, the direct-driving free wheels 13 and 16 are in gear and 12 and 15 out of gear, the piston Z), attached to revolving cylinder a, Fig. 6, to be in position between ports 55 56, and the piston Fig. 3, attached to tubular shaft 0, to be in the position shown by arrow A, Fig. 6: \Vhen steam is admitted through port 55. the piston is held in position by pawl on ratchet-wheel 5, Fig. 1. The other piston, j, is driven round, taking with it the tubular shaft 0, also the free wheels 16 and 15. The wheel 16 (by means of the clutch in collar 18, Fig. 1) also rotates the shaft and pulleywheel 38. When the piston 7' arrives at the position, say, B, (denoted by arrow at Fig. 6,) the roller on jumper 24 takes cam 39 of ratchetwheel 6 and moves slide 27 over port 41, shutting off steam from port 55, Fig. 8. The revolution is completed by expansion of steam already within cylinder a. engages against the piston b, the lap of flangeZ of piston 1' just opens exhaust-port 32, Fig. 8, the exhaust at this point not being full. The impetus of piston 3' (working in conjunction with tendency of steam to obtain a larger exhaust) drives the piston 6 over steam-port 55, in which position it will be seen the lap or W hen the piston j flange Z on piston j givesa full exhaust. The

cam then releases roller, steam again enters port 55, piston is -held in position by pawl 10, and piston I) in its turn is driven round.

On arriving again at point B, Fig. 6, steam is shut off again by means of cam w on cylinder (0 taking roller on rod 23 and moving slide 27 back again. This is relieved again, as in the former revolution, when piston b has driven piston j past steam-port During the revolution of piston b the ratchet-wheels 4 and 5 are driven round, (through couplings 21, see Fig. 14) taking with them free wheels 12 and 13. The free wheel 13 engages with the clutch of collar 18, and thus a continuous motion of shaft and pulley-wheel 38 is obtained.

WVith reference to Figs. 11 and 12, the steamchest 39 has two ports 40 and 41 cut in its outer faces 42 and 43, respectively, and so cut that when port 40 is open port 41 is closed, and vice versa. Formed in one with steam-chest 39' are two expansion valve-chests 44, in which work the expansion-rods 24 and 24. Springs 47 and 48 act on the inside face of expansion valve-chest 4: 1 and on the expansion-rods 24 and 2 1, respectively. \lVithin the steam-chest 39 move two plugs or slides 19 and 50, which are connected to red 51 by helical springs 52 and 53. Mounted on the outside end of rod 51 is a hand-wheel 54:, which operates the slides 19 and backward or forward, as the case may be. Over ports 10 and 11 slide the rods 24' and 24. A steampipe 57 enters the steam-chest 39 for conveyance of steam into the same. The action is as follows: Steam is admitted to steam-chest 39 through pipe 57 and in this position escapes through the port 4:1 into expansion valvechests 4A and thence to cylinder through port 55. The expansion-rods are operated upon by their respective cams, already described, and work in separate chambers 1 1 along the face of the steam-chest, closing ports 10 and 11 as required. By this means when the slide valves are forced over ports 40 and 41 the only pressure on rollers and cams is that caused by compression of the springs. The position of steam and exhaust ports with the steamchest is as follows: Assuming the stationary piston to be perpendicular, the steam-ports and 56 are cut 1n cover-plate, one on e1ther side of it and close to said plston. The position for exhaust-ports is as follows: After the moving piston has completed a revolution it comes in contact with the stationary piston and the end of the moving piston or lap will simultaneously open exhaustport.

\Vith reference to Figs. 17, 18, and 19, c' is the cover-plate with the steam and exhaust chest removed in order to show an alternative arrangement of cover-plate and different-pattern steam-chest provided with separate cylinders to facilitate the main piston passing the perpendicular. 55 and 56 are two steamports corresponding to those heretofore described. 32 and 33 are two exhaust-ports cut in cover leading from cylinder (0, and. 58 and 59 are the final exhaust-pipes, as hereinafter described. A small cylinder 60 is suitably attached to the outside of cover-plate 1?, in which slide two pistons 61 and 62, which are connected by a helical or other spring 63. On pistons 61 and 62 are cast or otherwise permanently fixed two smaller cylinders 64: and 65, respectively, in which slide two pistons 66 and 67, (shown at'Figs. 19 and 20,) and attached to each of these are bolts or rods 68 and 69, which slide in groove 7 0, cut in cylinder 60 and cover-plate '2, respectively. Steam is introduced into the small cylinders 64: and through the inlet 7 2 and 7 6. The exhaust cut-off covers the position designated by numeral 74 on steam-cover and leaves slide 7 0 clear on the inner side and 68 and 69 clear of the outside. With reference to Fig. 18, band j are two lins or pistons heretofore referred to, which have recesses 75, 76, 77, and 78 cut on their exterior top ends.

The mode of operation is as follows: As-

all

suming piston 7) to be in position between ports and 56 and piston j has completed nearly a revolution, such piston comes in corn tact with piston 72, opens exhaust 32. The recess 78 is opposite cylinder 6st. The exhausting steam enters at 72, Fig. 19, and drives rod or bolt 68 into recess 78. The pisten 61 in the cylinder 60 now moves back toward the exhaust-port 58, taking with it bolt or red 68, as this in being engaged in recess 78 takes the main piston j with it and drives 7) before it. The slide 71 moves also, and thus keeping the parts stcai'n-tight. When piston 61 passes linal exhaust-pipe 58, the piston 7' is then in position and piston 7) is past steam-port and exhausts the steam. thus releasing pressure behind bolt or rod 68 and is withdrawn by, a spring. The piston 61 returns to its former position by spring 63. The slide 71 is also moved back by spring 79, Fig. 17, or by a projection on the pistons 61 or 62, which when returning takes slide 71 with it. When it is required to reverse the engine, piston 62 is used,when port 33 is open and precisely the same action takes place. Cylinder 65 and piston. 62 acting now, owing to port being open and 32 closed, causes cylinder 6& and piston 61 to be out of action.

hat I claim as my invention, and desire to secure by Letters Patent, is---- i 1. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, mechanism for operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft and cylinder and. means for rotating said hollow shaft and cylinder, substantially as described.

2. In a rotary engine, a drivingshaft, ahollow shaft and a cylinder mounted thereon,

mechanism for operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft and cylinder and means for alternately rotating said hollow shaft and cylinder, substantially as described.

3. In a rotary engine, a driving-sluift, a hollow shaft and a cylinder mounted thereon, mechanism for operatively connecting said driving-shaft with and for discmmecting the same from said hollow shaft and cylinder and a plurality of pistons within said cylinder for rotating said hollow shaft and cylinder, substantially as described.

a. In a rotary engine, a driving-shaft, al1ollow shaft and a cylinder mounted thereon, a single mechanism for both. operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft and cylinder, and means for rotating said hollow shaft and cylinder, substantially as described.

5. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, mechanism for operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft andicylinder and a pair of pistons within said cylinder one mounted to rotate said cylinder and one mounted to rotate said hollow shaft, substantially as described.

6. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder open at one end mounted thereon, a suitable casing for said cylinder provided with inlet and exhaust ports, mechanism for both operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft and cylinder and a pair of pistons within said cylinder for rotating said hollow shaft and cylinder, substantially as described.

7. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder open at one end mounted thereon, a suitable casing for said cylinder provided with inlet and exhaust ports, mechanism for both operatively connecting said driving-shaft with and for disconnecting the same from said hollow shaft and cylinder and a pair of pistons within said cylinder for alternately rotating said hollow shaft and cylinder, substantially as described.

8. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, clutch mechanism for connecting said drivingshaft with said hollow shaft and cylinder, and means for rotating said hollow shaft and cylinder, substantially as described.

9. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, independent clutch mechanisms for connecting said driving-shaft with said hollow shaft and cylinder, and a pair of pistons within said cylinder for alternately rotating said hollow shaft and cylinder, substantially as described.

10. In arotary engine, a driving-shaft,a hollow shaft and a cylinder open at one end mounted thereon, a suitable casing for said cylinder provided with inlet and exhaust ports, independent clutch mechanisms for connecting said driving-shaft with said hollow shaft and cylinder, a pair of pistons within said cylinder one mounted to rotate said hollow shaft and one mounted to rotate said cylinder, and means for alternately actuating said pistons, substantially as described.

11. Inarotary engine, adriving-shaft,ahollow shaft and a cylinder open at one end mounted thereon, a suitable casing for said cylinder provided with inlet and exhaust ports, independent clutch mechanisms for connecting said driving-shaft with said hollow shaft and cylinder, a pair of pistons within said cylinder one mounted to rotate said hollow shaft andone mounted to rotate said cylinder, and a valve mechanism for alternately actuating said pistons, substantially as described.

12. In a rotary engine, a driving-shaft, means for rotating said shaft in one direction and a clutch mechanism in combination with a ratchet and pawl for reversing the direction of rotation, substantially as described.

13. In a rotary engine, a driving-shaft, a

cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and pistons, means for rotating said pistons in one direction and a clutch mechanism in combination with a ratchet and pawl for reversing the direction of rotation, substantially as described.

14:. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and said pistons, a steamchest adjacent said cylinder provided with ports for direct and reverse driving, a suitable valve-gear for admitting steam through said ports to said pistons, and means for closing either of said ports as may be desired, substantially as described.

15. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and said pistons, a steamchest adjacent said cylinder provided with ports for direct and reverse driving, a suitable valve-gear for admitting steam through said ports to said pistons, and hand-operated means for closing either of said ports as may be desired, substantially as described.

16. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and said pistons, means for rotating said pistons, and means for locking said pistons against back pressure, substantially as described.

17. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and said pistons, a suitable valve mechanism for rotating said pistons in either direction, and a ratchet and pawl for locking said pistons against back pressure, substantially as described.

18. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a plurality of pistons for said cylinder, operative connections between said shaft and said pistons, a suitable valve mechanism for rotating said pistons in either direction, and aseparate ratchet and pawl for locking each of said pistons against back pressure in either direction of rotation, substantially as described.

19. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a two-part piston mounted on the inner surface of the cylindercasing, and means between said parts for making a steam-tight joint at the junction of said piston with said driving-shaft, substantially as described.

20. In a rotary engine, a driving-shaft,-a cylinder mounted thereon, a two-part piston mounted on the inner surface of the cylindercasing, and a spring between said parts for making a steam-tight joint at the junction of said piston with said driving-shaft, substantially as described.

21. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, a two-part piston mounted on said hollow shaft within said cylinder, and means between said parts for making a steam-tight joint at the junction of said piston with said cylinder, substantially as described.

22. In a rotary engine, a driving-shaft, a hollow shaft and a cylinder mounted thereon, a two-part piston mounted on said hollow shaft within said cylinder, and a spring between said parts for making a steam-tight joint at the junction of said piston with said cylinder, substantially as described.

23. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a piston therein formed in two parts, one of said parts provided with a sleeve in Which the other of said parts is constructed to lit, and means between said parts for forcing them apart to make a steam-tight joint at the ends of the piston, substantially as described.

24. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a piston therein formed in two parts, one of said parts provided with a sleeve in which the other of said parts is constructed to fit, means between said parts for forcing them apart to make a steamtight joint at the ends of the piston, side packing-pieces and means between said piston and said side pieces for making a steam-tight joint at the sides of the piston, substantially as described.

25. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder, a valve-rod and valve for controlling said inlet-port, a jumper-rod operatively connected to said valve-rod, and means on said cylinder for engaging said jumper-rod and controlling the point of cutofi', substantially as described.

26. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided. with inlet and exhaust ports to said cylinder, a valve-rod and valve for controlling said inlet-port, a jumper-rod operatively connected to said valve-rod, and a cam-surface. on said cylinder for engaging said jumper-rod and controlling the point of cut-off, substantially as described.

27. In a rotary engine, a driving-shaft, a cylinder mountedto rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder, a valve-rod and valve "for controlling said inlet-port, a jumper-rod operatively connected to said valve-rod, means for normally keeping said inlet-port uncovered, and means on said cylinder for engaging said jumper-rod and controlling the point of cutoff, substantially as described.

28. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder, a valve-rod and valve for controlling said inlet-port, a jumper-rod operatively connected to said valve-rod, a spring connected to said valve-rod .ior normally keeping said inlet-port uncovered, and a can1-sur face on said cylinder for engaging said jumper-rod and controlling the pointof cutoff, substantially as described.

29. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder for both direct and reverse driving, a valve-rod and alve'l or controlling each of said inlet-rmrts, jumper-rods operatively connected to said valve-rods, means for normally keepingsaidinlet-ports uncovered, and means on said cylinder for engaging said jum 'ier-rods and controlling the point oi cut off, substantially as described.

30. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder for both direct and reverse driving, a valve-rod and alve for controlling each oi said inlet-ports, jumper-rods operatively connected to said vah e-rods, means for normally keeping said inletports uncovered, means on said cylinder 'for engaging said jumper-rods and controlling the point of cutoff, and means independent of said valves for temporarily covering either of said inlet-ports as may be desired, substantially as described.

31. In a rotary engine, a driving-shaft, a cylinder mounted to rotate thereon, a steamchest provided with inlet and exhaust ports to said cylinder for both direct and reverse driving, a val ve-rod and valve for controlling each of said inlet-ports, jumper-rods operatively connected to said valve-rods, springs for normally keeping said inlet-ports uncovered, and cam-surfaces on said cylinder for engaging said jumper-rods and controlling the point of cutoff, substantially as described.

32. In a rotary engine,adriving-shaft, ahollow shaft and a cylinder mounted thereon, operative connections between said driving-shaft and said hollow shaft and cylinder, a pair of pistons constructed to rotate said cylinder and said shaft, a steam-chest provided with inlet and exhaust ports to said cylinder, a valve-rod and valve for controlling said inlet-port, a jumper rod operatively connected to said valve-rod, means for normally keeping said inlet-port uncovered, means on said cylinder for engaging saidv jumpel roc l and controlling the point of cut otl' to said cylinderqaiston, and means on said hollow shaft for engaging said valve-rod and controlling the point of cut-oil to said hollow-shaft piston, substantially as described.

33. In a rotary engine, a d riving-shaft, a hollow shaft and a cylinder mounted thereon, operative connections between said d living-shaft and said hollow shaft and cylinder, a pair of pistons constructed to rotate said cylinder and said shaft, :1. steam-chest provided with inlet and exhaust ports to said cylinder, a valve-rod and valve for controlling said inlet-port, a jumper-rod operatively connected to said valve-rod, means for normally keeping said inlet-port uncovered, a cam-surface on said cylinder for engaging said jumper-rod and controlling the point of cut-off to said cylinder-piston, and a cam-surface on said hollow shaft for engaging said valve-rod and controlling the point of cut-off to said hollowshaft piston, substantially as described.

34. In a rotary engine, a driving-shaft, a cylinder mounted thereon, a suitable casing for said cylinder, means for rotating said cylinder, an antifriction-bearing between said 

